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First Battle of the Marne
Fought from September 6-12, 1914; marked the beginning of trench warfare as soldiers dug in to hold their ground.
First Battle of Ypres
Took place from October 19 to November 22, 1914; aimed to control the strategic port of Ypres.
Second Battle of Ypres
Occurring from April 22 to May 25, 1915; notable for the first large-scale use of poison gas by German forces.
Siege of Verdun
Lasted from February 21 to December 18, 1916; one of the longest and costliest battles of WWI.
Battle of the Somme
Fought between July 1 and November 18, 1916; known for over 1 million casualties, it was one of the bloodiest battles in history.
Battle of Passchendaele
Took place from July 31 to November 10, 1917; infamous for the horrific conditions and substantial losses.
100 Days Offensive
Lasted from August 9 to November 11, 1918; this series of attacks resulted in over 2.2 million casualties and led to an armistice.
Balkan Conflicts (1908-1913)
A series of conflicts in the Balkans involving territorial disputes and ethnic tensions among Balkan states.
Austria-Hungary Annexation of Bosnia-Herzegovina (1908)
The annexation caused tensions in the region, especially between Austria-Hungary and Serbia, backed by Russia.
Bosnian Crisis (1908)
A diplomatic crisis where Germany threatened military action against Russia, escalating tensions in the Balkans.
First Balkan War (1912)
A conflict where Balkan states banded together to drive the Ottoman Empire out of the Balkans.
Second Balkan War (1913)
A conflict among Balkan states after the First Balkan War, primarily over territorial disputes.
Ethnic Hatred in the Balkans
Long-standing ethnic and religious tensions between Christians and Muslims in the region, exacerbated by conflict.
Role of European Nations in Balkan Wars
European powers attempted to limit the conflict's spread and maintain balance in the region.